V6NetHandle: NET6-2001-4970-1 OrgID: TL-801 Parent: NET6-2001-4800-0 NetName: ADHOST-V6-BLK1 NetRange: 2001:4970:: - 2001:4970:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 11274 RegDate: 2005-10-19 Updated: 2017-07-06 Source: ARIN OrgID: TL-801 OrgName: TierPoint, LLC CanAllocate: Street: 12444 Powerscourt Drive Suite 450 City: St. Louis State/Prov: MO Country: US PostalCode: 63131 RegDate: 2017-01-18 Updated: 2017-12-20 ReferralServer: rwhois://rwhois.tierpoint.net:4321 OrgTechHandle: CHEEK1-ARIN OrgTechHandle: CZUMB2-ARIN OrgAbuseHandle: TIERP2-ARIN OrgNOCHandle: TIERP3-ARIN OrgAdminHandle: CHEEK1-ARIN Source: ARIN
IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.
Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.